|Date|Name|Nationality|Tonnage (GRT)|Fate|
|---|---|---|---|---|
|7 October 1941|Svend Foyn|United Kingdom|14,795|Damaged|
|16 February 1942|Monagas|Venezuela|2,650|Sunk|
|16 February 1942|San Nicholas|United Kingdom|2,391|Sunk|
|16 February 1942|Tia Juana|United Kingdom|2,395|Sunk|
|22 February 1942|J.N.Pew|United States|9,033|Sunk|
|23 February 1942|Sun|United States|9,002|Damaged|
|23 February 1942|Thalia|Panama|8,329|Sunk|
|11 May 1942|Cape of Good Hope|United Kingdom|4,963|Sunk|
|24 May 1942|Gonçalves Dias|Brazil|4,996|Sunk|
|28 May 1942|Alcoa Pilgrim|United States|6,759|Sunk|
|3 June 1942|M.F. Ellliot|United States|6,940|Sunk|
|9 June 1942|Bruxelles|Belgium|5,085|Sunk|
|9 June 1942|Franklin K. Lane|United States|6,589|Sunk|
|15 June 1942|Cold Harbor|Panama|5,010|Sunk|
|15 June 1942|Scottsburg|United States|8,010|Sunk|
|15 June 1942|West Hardaway|United States|5,702|Sunk|

Question: how many ships were attacked by u-502 but not sunk?
Answer: 2